A backup is a copy of an Internet site which is kept on a different server and can be restored if a problem occurs with the live site - a failed script update, an unintentional deletion of a file or of the entire database, and so on. Restoring the Internet site the way it was shall remove or lessen the damage the issue may have caused, that's by all means an obviously better option than having to reconstruct the whole Internet site from scratch. Even though you could download a copy of your content on your PC, keeping a backup is a function that almost all web hosting companies offer as part of their plans. You have to take a look at how frequently they do that, though, because some companies create a backup just once every 7 days, which can be far from enough for a booking site or an e-commerce portal in which the information is updated each day. It's adviseable to see how easily a backup could be restored, which could be vital if some problem appears on your website.